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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2019
Accounting Policies [Abstract] |
Advertising Costs | Advertising costs for the three and nine months ended September 30, 2019 and 2018, are reflected in the following table (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Advertising costs | $ | 13,557 |  |  | $ | 12,629 |  |  | $ | 41,386 |  |  | $ | 40,126 |
Internal-Use Software Development Costs Capitalized | Internal-use software development costs capitalized for the three and nine months ended September 30, 2019 and 2018, are reflected in the following table (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Internal-use software development costs | $ | 11,388 |  |  | $ | 1,148 |  |  | $ | 24,290 |  |  | $ | 3,415 |

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